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traitorous (adj.)

late 14c., "guilty of treason," apparently from Old French traitros "treacherous" (13c.), from traitor (see traitor). Related: Traitorously; traitorousness.

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Definitions of traitorous from WordNet

traitorous (adj.)
having the character of, or characteristic of, a traitor;
a lying traitorous insurrectionist
From wordnet.princeton.edu